Value Collection C85879 Uss Flat Washer 5/16 in Steel

Product Description

The VALUE COLLECTION C85879 is a USS flat washer designed for use with 5/16 inch fasteners in general mechanical and structural assembly applications. Manufactured from Grade 8 steel with a zinc-plated finish, this washer distributes load across a bearing surface to protect materials and reduce fastener pull-through. The 3/8 inch inside diameter seats cleanly over a 5/16 inch screw or bolt shank, while the 7/8 inch outside diameter provides a broad clamping surface. The zinc plating offers baseline corrosion resistance in dry to mildly humid service environments. At 5/64 inch thick, the washer delivers solid backing without adding excessive stack height to the assembly.

This washer suits a wide range of trade and industrial applications including HVAC equipment mounting, plumbing fixture installation, electrical panel assembly, and general structural fastening. The USS flat washer series follows United States Standard sizing, which specifies a larger outside diameter relative to screw size compared to SAE flat washers, making it the preferred choice when greater load distribution is needed on softer substrates or oversized clearance holes.

Key Features

• Grade 8 steel construction for high-strength load bearing
• Zinc-plated finish provides corrosion resistance in standard service environments
• USS series sizing delivers a wider bearing surface than SAE equivalents
• 3/8 inch ID fits 5/16 inch screw or bolt shanks without modification
• 7/8 inch OD spreads clamping load to minimize surface damage and pull-through
• 5/64 inch thickness maintains a low profile in tight fastening assemblies

Compatibility

Designed as a standard USS flat washer for use with 5/16 inch screws and bolts in inch-measurement fastening systems across HVAC, plumbing, electrical, and general mechanical applications.

Installation Notes

Install this washer between the fastener head or nut and the mating surface before torquing. Ensure the inside diameter seats fully over the fastener shank with no binding. Inspect the zinc coating for damage before installation in moisture-exposed locations, and replace any washer showing corrosion or deformation. No specialized tools are required; standard wrenches and socket sets apply.